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From Peter Schuller <peter.schul...@infidyne.com>
Subject Re: JVM 7, Cass 1.1.1 and G1 garbage collector
Date Tue, 11 Sep 2012 03:26:12 GMT
> I am currently profiling a Cassandra 1.1.1 set up using G1 and JVM 7.
>
> It is my feeble attempt to reduce Full GC pauses.
>
> Has anyone had any experience with this ? Anyone tried it ?

Have tried; for some workloads it's looking promising. This is without
key cache and row cache and with a pretty large young gen.

The main think you'll want to look for is whether your post-mixed mode
collection heap usage remains stable or keeps growing. The main issue
with G1 that causes fallbacks to full GC is regions becoming
effectively uncollectable due to high remembered set scanning costs
(driven by inter-region pointers). If you can avoid that, one might
hope to avoid full gc:s all-together.

The jury is still out on my side; but like I said, I've seen promising
indications.

-- 
/ Peter Schuller (@scode, http://worldmodscode.wordpress.com)

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